So, here's a pic from Gronk's highly anticipated GQ article ... in which the photo shoot motivation was apparently, "Surprise! Here's my dong!"
The flashee in the shot is supermodel Hailey Clauson -- who teamed up with the Pats tight end for the cover of the upcoming June issue of the magazine.
"Gronkowski seems to exist in a permanent shower of champagne spray and nightclub-foam-party foam .